Seasonal variability in the thermohaline structure of the Western Pacific Warm Pool

doi:10.1007/s13131-015-0696-6

IOCAS-IR > 海洋环流与波动重点实验室

	Seasonal variability in the thermohaline structure of the Western Pacific Warm Pool
	Qin Sisi1,2 ; Zhang Qilong 1; Yin Baoshu 1
	2015-07-01
发表期刊	ACTA OCEANOLOGICA SINICA
卷号	34 期号:7 页码:44-53
文章类型	Article
摘要	Using the 28A degrees C isotherm to define the Western Pacific Warm Pool (WPWP), this study analyzes the seasonal variability of the WPWP thermohaline structure on the basis of the monthly-averaged sea temperature and salinity data from 1950 to 2011, and the dynamic and thermodynamic mechanisms based on the monthly-averaged wind, precipitation, net heat fluxes and current velocity data. A Delta T=-0.4A degrees C is more suitable than other temperature criterion for determining the mixed layer (ML) and barrier layer (BL) over the WPWP using monthly-averaged temperature and salinity data. The WPWP has a particular thermohaline structure and can be vertically divided into three layers, i.e., the ML, BL, and deep layer (DL). The BL thickness (BLT) is the thickest, while the ML thickness (MLT) is the thinnest. The MLT has a similar seasonal variation to the DL thickness (DLT) and BLT. They are all thicker in spring and fall but thinner in summer. The temperatures of the ML and BL are both higher in spring and autumn but lower in winter and summer with an annual amplitude of 0.15A degrees C, while the temperature of the DL is higher in May and lower in August. The averaged salinities at these three layers are all higher in March but lower in September, with annual ranges of 0.41-0.45. Zonal currents, i.e., the South Equatorial Current (SEC) and North Equatorial Counter Current (NECC), and winds may be the main dynamic factors driving the seasonal variability in the WPWP thermohaline structure, while precipitation and net heat fluxes are both important thermodynamic factors. Higher (lower) winds cause both the MLT and BLT to thicken (thin), a stronger (weaker) NECC induces MLT, BLT, and DLT to thin (thicken), and a stronger (weaker) SEC causes both the MLT and BLT to thicken (thin) and the DLT to thin (thicken). An increase (decrease) in the net heat fluxes causes the MLT and BLT to thicken (thin) but the DLT to thin (thicken), while a stronger (weaker) precipitation favors thinner (thicker) MLT but thicker (thinner) BLT and DLT. In addition, a stronger (weaker) NECC and SEC cause the temperature of the three layers to decrease (increase), while the seasonal variability in salinity at the ML, BL, and DL might be controlled by the subtropical cell (STC).
关键词	Western Pacific Warm Pool Thermohaline Structure Barrier Layer Mixed Layer Seasonal Variability
DOI	10.1007/s13131-015-0696-6
收录类别	SCI
语种	英语
WOS记录号	WOS:000358256500005
引用统计	被引频次：7[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/49208
专题	海洋环流与波动重点实验室
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao 266071, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
第一作者单位	海洋环流与波动重点实验室
推荐引用方式 GB/T 7714	Qin Sisi,Zhang Qilong,Yin Baoshu. Seasonal variability in the thermohaline structure of the Western Pacific Warm Pool[J]. ACTA OCEANOLOGICA SINICA,2015,34(7):44-53.
APA	Qin Sisi,Zhang Qilong,&Yin Baoshu.(2015).Seasonal variability in the thermohaline structure of the Western Pacific Warm Pool.ACTA OCEANOLOGICA SINICA,34(7),44-53.
MLA	Qin Sisi,et al."Seasonal variability in the thermohaline structure of the Western Pacific Warm Pool".ACTA OCEANOLOGICA SINICA 34.7(2015):44-53.

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